public class Hello{
  Runnable r1 = () -> { System.out.println(this); } ;
  Runnable r2 = () -> { System.out.println(toString()); } ;

  public String toString() { return "Hello, world!"; }

  public static void main(String args[]) {
    new Hello().r1.run();
    new Hello().r2.run();
   
      
  }
}
